Albert lavocat and edouard candlot



No. 6l4,730. PatentedNov. 22, I898. A. LAVOCAT &. E. CANDLOT.CEMENTKILN.

' (Application filed Da. 31, 1897.) (N o M o d e l mivwxszsea nvezziom Me/YZZ if Z M ,Zalozifral UNITED STATES PATENT OFFICE.

ALBERT LAVOOAT AND EDOUARD OANDLOT, OF PARIS, FRANCE.

CEMENTQKILN.

SPECIFICATION forming part of Letters Patent N 0. 614,730, dated.November 22, 1898. Application filed December 31, 1897. serial No.664,908. (No model.)

To all whom it may concern:

Be it known that we, ALBERT LAVOOAT and EDOUARD CANDLOT, citizens ofFrance, residing at Paris, France, have invented a new and usefulImprovement in Cement Kilns or Furnaces, (for which we have obtainedpatents in France, No. 254,264, dated February 25, 1896; in Belgium,No.120,812, dated April 10, 1896, and in Germany, No. 89,606, datedMarch 1, 1896,) of which the following is a specification.

Our invention relates to kilns for burning lime, cement, and othersubstances.

In kilns of this type it is desirable that the substance burned shouldbe discharged from the grate at all points of the latter and be causedto descend at an equal rate as nearly as possible at every point. It isalso desirable that the operation of discharging said material becarried on rapidly to prevent any part of the material from fusing andsticking to the grate.

In many kilns now in use the Withdrawal of the burned substances iseffected by displacing the bars of the grate without any regard beingpaid to the particular spot where the discharged substances may fall.This method is objectionable in several respects. The grates arenecessarily of considerable size, and in these large grates it is nextto an impossibility to displace the bars simultaneously at all points inthe grate. The work is slow and tedious, and any portion of 'theoutfiowing substance that happens to be a little larger than the restmay block the whole and stop the discharge at any moment. Moreover, thedischarge cannot be arrested by the operator at any point he may wish tostop it, since the grate-bars cannot be restored to place as long as theweight of the load or charge is resting upon them. Finally, in order toslip the grate the workmen are compelled to stand beneath it, where theynot.

only are in a thick dust, but are exposed to contact with the escapingsubstances, which are either red-hot or at avery high temperature.

In our invention we aim to avoid these objections, and to enable othersto fully understand and practice the same we will explain said inventionin detail and then particularly point out and define the novel featuresthereof in the claims.

For the purposes of the following description reference will be had tothe accompanying drawings, in which- Figure 1 is a sectional elevation,the sectional portion being on a line from front to rear, showing agrate for a kiln constructed in accordance with our invention. Fig. 2 isa view of the same parts in front elevation, the line of sight being ata right angle to that in Fig. 1. Fig. 3 is a sectional elevation similarto Fig. 1, showing a slightly-modified constrnction.

The reference-letter A in said drawings indicates a part of the bars ofthe grate, and B denotes the remainder of said bars. These two series ofbars are arranged at front and rear and are inclined relatively to eachother at a suitable angle, that shown in the present instance beingrather less than a right angle and greater than forty-five degrees. Thebars B also are longer than the bars A and extend above the top andbelow the lower ends of the latter, as shown in Fig. 1, a space a beingprovided between the lower ends of the bars A and the corresponding endsof the bars B, which preferably lie below and substantially in the sameplane with the bars A. This space a is of sufficient width to permit thefree passage of the substance burned in pieces of any usual size.

Nearly upon the same level as the lower ends of the bars B are arrangedplates 0, lying in or nearly in a horizontal plane and sup ported upon afulcrum or pivot 0 which lies directly under the opening a. These platesare provided with counterbalancing-weights D, mounted upon thoseportions of said plates which lie beneath the bars B, by which they aresustained, so far as their own weight is regarded, in positionrelatively to the bars A and B, as shown in Fig. 1. In order to maintainthis position in the event of any further weight being placed upon theparts of said plates that lie beneath the bars A, we provide a lever E,one end of which lies beneath the free ends of the plates and cooperateswith the weights D in holding them in a normal position in case a partof the substance that is being burned should pass through the opening aand fall upon said plates, as is commonly the case.

The cement, lime, or other material that is being burned is arrested andretained by the grate-bars A B as long as the plates 0 remain in ahorizontal or substantially horizontal position, as may be seen inFig. 1. When the kiln is to be emptied, the workman merely turns thelever E upon its fulcrum 6, so as to remove the supporting end of saidlever from beneath the plates 0. The weight of the load or of thatportion which has passed through the opening a and is resting upon theplates overcomes the counterbalance and the plates tiltdownwardgvhereupon the substance in the kiln shoots down through theopening a and over the plates C until the kiln is completely discharged.

Should it be necessary to arrest the discharge from the kiln before thelatter is empty, the lever E is released, and its tendency to restoreitself, together with the operation of the weights D, immediately raisethe plates 0 and stop the discharge.

lVhen the kiln has two or more orifices, the grate-bars may beduplicated, the two sets of bars B being formed in the shape of aninverted letter V and hung upon a central supporting-barB which liesinthe angle between the two sets of bars, as in Fig. The plates 0 andlevers E will also be duplicated. It is preferable in every form toprovide auxiliary supports B for the grate-bars; but the precise detailsof construction form no part of our invention, as we do not restrictourselves to any specific features of such character.

To enable the operator to discharge the grate at any one of severaldilferent points, as well as to discharge the whole simultaneously, thedischarging device is divided into three parts, as indicated by thereferenceletters 0 C G in Fig. 2, each capable without any materialchange of being operated independently of both the others. The middleplate C is preferably of greater width than the side plates, as shown inFig. c.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is V 1. In a kiln for burning lime, cement,and other substances, the combination with gratebars, arranged toconverge downward and having an opening between their lower ends, of aplurality of plates mounted on a pivotal support beneath said opening, alever having one end lying underneath the ends of said plates, tonormally maintain them in a horizontal position andcounterbalancing-weights cooperating with said lever and adapted torestore said plates to their normal position, substantially asdescribed.

2. In a kiln for burning lime, cement, and other substances, thecombination with gratebars which converge to an opening at their lowerends, of a plurality of plates pivoted to lie beneath said opening,eounterbalancingweights hung upon arms which project from said plates,and a lever having one end lying beneath the counterbalanced ends ofsaid plates, substantially as described.

3. In a kiln for burning lime, cement, and other substances, thecombination with two series of inclined grate-bars, one series beinglonger than, and extending below, the other series to form an openingbetween the lower ends of the two series for the discharge of material,of plates pivoted beneath said opening and having arms which project onone side of the pivot and under the longergratebars,counterbalancing-weights mounted upon said arms, and a leverfulcrumed upon the other side of the pivot for said plates and havingone end lying beneath the counterbalanced ends of said plates,substantially as described.

In testimony whereof wehave signed this specification in the presence oftwo subscribing witnesses.

ALBERT LAVO CAT. EDOUARD OANDLOT.

lVitnesses:

EDWARD P. MACLEAN, IIIPPOLYTE Zo'r'rn.

